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All crews since A-11 (and perhaps some earlier) observed light flashes when in the dark or when they closed their eyes, while in transit to and from the Moon, on the surface, and in lunar orbit.
Site Selection:
In the CM during coast periods. Casual observations from the LM were made, too.
Deploying experiment:
The ALFMED unit was donned like a helmet with a face shield.
Check-out of experiment: NA
Operation of experiment:
The A-15 crew had observing sessions with eye shades on during the trans-lunar and trans-Earth coasts. They reported the flashes to MCC real-time. Also, the CMP had an observing session in lunar orbit and the crew on the surface reported that they saw flashes while in the LM. The LMP reported that the frequency of flashes was lower when he was lying on his stomach in his hammock than when he was on his back.